diff --git a/src/crewai/agent.py b/src/crewai/agent.py
index d828cf7f39..b3850095d8 100644
--- a/src/crewai/agent.py
+++ b/src/crewai/agent.py
@@ -93,7 +93,6 @@ class Agent(BaseModel):
     )
     llm: Optional[Any] = Field(
         default_factory=lambda: ChatOpenAI(
-            temperature=0.7,
             model_name="gpt-4",
         ),
         description="Language model that will run the agent.",
@@ -109,6 +108,7 @@ def _deny_user_set_id(cls, v: Optional[UUID4]) -> None:
 
     @model_validator(mode="after")
     def set_private_attrs(self):
+        """Set private attributes."""
         self._logger = Logger(self.verbose)
         if self.max_rpm and not self._rpm_controller:
             self._rpm_controller = RPMController(
@@ -118,12 +118,16 @@ def set_private_attrs(self):
 
     @model_validator(mode="after")
     def check_agent_executor(self) -> "Agent":
+        """Check if the agent executor is set."""
         if not self.agent_executor:
             self.set_cache_handler(self.cache_handler)
         return self
 
     def execute_task(
-        self, task: str, context: str = None, tools: List[Any] = None
+        self,
+        task: str,
+        context: Optional[str] = None,
+        tools: Optional[List[Any]] = None,
     ) -> str:
         """Execute a task with the agent.
 
@@ -157,17 +161,27 @@ def execute_task(
 
         return result
 
-    def set_cache_handler(self, cache_handler) -> None:
+    def set_cache_handler(self, cache_handler: CacheHandler) -> None:
+        """Set the cache handler for the agent.
+
+        Args:
+            cache_handler: An instance of the CacheHandler class.
+        """
         self.cache_handler = cache_handler
         self.tools_handler = ToolsHandler(cache=self.cache_handler)
         self.__create_agent_executor()
 
-    def set_rpm_controller(self, rpm_controller) -> None:
+    def set_rpm_controller(self, rpm_controller: RPMController) -> None:
+        """Set the rpm controller for the agent.
+
+        Args:
+            rpm_controller: An instance of the RPMController class.
+        """
         if not self._rpm_controller:
             self._rpm_controller = rpm_controller
             self.__create_agent_executor()
 
-    def __create_agent_executor(self) -> CrewAgentExecutor:
+    def __create_agent_executor(self) -> None:
         """Create an agent executor for the agent.
 
         Returns:
diff --git a/src/crewai/crew.py b/src/crewai/crew.py
index 1a847fe6b1..ee2cb4947c 100644
--- a/src/crewai/crew.py
+++ b/src/crewai/crew.py
@@ -33,7 +33,7 @@ class Crew(BaseModel):
         process: The process flow that the crew will follow (e.g., sequential).
         verbose: Indicates the verbosity level for logging during execution.
         config: Configuration settings for the crew.
-        cache_handler: Handles caching for the crew's operations.
+        _cache_handler: Handles caching for the crew's operations.
         max_rpm: Maximum number of requests per minute for the crew execution to be respected.
         id: A unique identifier for the crew instance.
     """
@@ -71,11 +71,22 @@ def _deny_user_set_id(cls, v: Optional[UUID4]) -> None:
 
     @classmethod
     @field_validator("config", mode="before")
-    def check_config_type(cls, v: Union[Json, Dict[str, Any]]):
+    def check_config_type(
+        cls, v: Union[Json, Dict[str, Any]]
+    ) -> Union[Json, Dict[str, Any]]:
+        """Validates that the config is a valid type.
+
+        Args:
+            v: The config to be validated.
+
+        Returns:
+            The config if it is valid.
+        """
         return json.loads(v) if isinstance(v, Json) else v
 
     @model_validator(mode="after")
-    def set_private_attrs(self):
+    def set_private_attrs(self) -> "Crew":
+        """Set private attributes."""
         self._cache_handler = CacheHandler()
         self._logger = Logger(self.verbose)
         self._rpm_controller = RPMController(max_rpm=self.max_rpm, logger=self._logger)
@@ -110,8 +121,15 @@ def _setup_from_config(self):
         self.agents = [Agent(**agent) for agent in self.config["agents"]]
         self.tasks = [self._create_task(task) for task in self.config["tasks"]]
 
-    def _create_task(self, task_config):
-        """Creates a task instance from its configuration."""
+    def _create_task(self, task_config: Dict[str, Any]) -> Task:
+        """Creates a task instance from its configuration.
+
+        Args:
+            task_config: The configuration of the task.
+
+        Returns:
+            A task instance.
+        """
         task_agent = next(
             agt for agt in self.agents if agt.role == task_config["agent"]
         )
@@ -140,8 +158,12 @@ def _sequential_loop(self) -> str:
             self._rpm_controller.stop_rpm_counter()
         return task_output
 
-    def _prepare_and_execute_task(self, task):
-        """Prepares and logs information about the task being executed."""
+    def _prepare_and_execute_task(self, task: Task) -> None:
+        """Prepares and logs information about the task being executed.
+
+        Args:
+            task: The task to be executed.
+        """
         if task.agent.allow_delegation:
             task.tools += AgentTools(agents=self.agents).tools()
 
diff --git a/src/crewai/task.py b/src/crewai/task.py
index 89af3f2982..49b7e59fdc 100644
--- a/src/crewai/task.py
+++ b/src/crewai/task.py
@@ -39,11 +39,12 @@ def _deny_user_set_id(cls, v: Optional[UUID4]) -> None:
 
     @model_validator(mode="after")
     def check_tools(self):
+        """Check if the tools are set."""
         if not self.tools and (self.agent and self.agent.tools):
             self.tools.extend(self.agent.tools)
         return self
 
-    def execute(self, context: str = None) -> str:
+    def execute(self, context: Optional[str] = None) -> str:
         """Execute the task.
 
         Returns: